While rice is still warm, mix cooked sushi rice with most of dressingIf using fish sticks, cook according to package directions; cool

Firmly press half of sushi rice into 9" springform pan

Spicy Mayonnaise: Combine sriracha and mayonnaise - whisk together

Frost this layer with a generous amount of sriracha mayoTop with cucumbers, scallions, and fishFirmly press remaining rice on topRefrigerate a few hours or overnightWhen ready to serve, remove from springform panFrost with additional sriracha mayonnaiseMix chopped avocados with lime juiceGarnish cake with avocados, sesame seeds and additional vegetables or fish as desiredAllow cake to sit at room temperature about one half hour before serving

Serve with extra sriracha mayonnaise, nori chips, soy sauce and/or wasabi on the sideAvocados can be used as part of layer instead of as topping.